19749540265 has 48 divisors (see below), whose sum is σ = 29398923648. Its totient is φ = 12470934528.

The previous prime is 19749540259. The next prime is 19749540277. The reversal of 19749540265 is 56204594791.

It is not a de Polignac number, because 19749540265 - 2⁷ = 19749540137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2616577 + ... + 2624113.

It is an arithmetic number, because the mean of its divisors is an integer number (612477576).

Almost surely, 2^19749540265 is an apocalyptic number.

It is an amenable number.

19749540265 is a deficient number, since it is larger than the sum of its proper divisors (9649383383).

19749540265 is a wasteful number, since it uses less digits than its factorization.

19749540265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018 (or 8005 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 19749540265 in words is "nineteen billion, seven hundred forty-nine million, five hundred forty thousand, two hundred sixty-five".